Lathe-dog.



M. Ii. PESTEH.

LATHE DOG. APPLICATIN man ocT.19. w18.

Patented Apr. 8, 1919.

MAXWELL E. PESTER, 0F MILFORD, CONNECTICUT.

' LATER-Doe.

Specification of Letters Patent.

Patented Apr. 8, 1919.

Application filed October 19, 1918. Serial 110.258,91?.

To all whom t may concern:

Be it known that I, MAXWELL E. PEs'rER, a citizen of the United States, and resident of Milford, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Lathe Dogs, of which the following is a specification.

My invention relates to new and useful improvements in lathe dogs such as are employed for fastening pieces of work to the face plate of lathes.

The object of the invention is to improve upon this class of device by providing a double tailed dog having additional means for firmly securing it to the face plate so as to form a firm and reliable attachment, to provide what may be termed abalance safety lathe dog that is one which will have substantially the same amount of metal disposed upon the two extended portions, either side of its center, and whereby an accurate operation will be assured, and finally to provide a construction of a` dog wherein the work may be so held that slight tapers may be cut upon the surface of the stock in a very simple and practical manner.

A further feature of the invention is to design the dog in a simple manner and so as to include no sharp or abrupt corners, edges or extended screws to engage or catch the clothing orstrike the hands of the operator when using the same. f

With these and other objects in view the invention resides and consists in the construction and novel combinationL and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction wit-hin the scope of the claims m-ay be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Similar characters of reference denote like or corresponding parts throughout the several figures of the accompanying drawings forming a part of this specification, and upon which,

Figure 1 shows a top plan view of my improved form of lathe dog, and

Fig. 2 shows a side or edge view of the same as applied to a lathe plate, and with a piece of stock indicated therein in dotted lines.

Referring in detail to the characters of reference marked upon the drawings, 5 indicates the main body of the dog, which is formed of a single piece of metal, and is provided with a set screw 6 that extends into the central hole 7. This hole is provided to acconnnodate the bar of stock 8 or other parts to be operated upon, and which is secured therein by means of the above men tio-ned set screw 6. The head of this screw is preferably arranged upon the inner side @adjacent to the opening 7 and is designed so that no portion of it will be extended from the outer surface of the dog, thus preventing any possibility of striking and injuring the operator.

In order to better position the various sizes of bars of stock central within the opening 7 I provide several sizes of blocks 9 to form a rest or bea-ring within the opening for the stock. One of these blocks is shown in position in the opening in Fig. 2 and as will be seen is shaped to conform to both the size of the opening as well as the surface of the bar and is further provided with a 'pin 10 that sets into a recess formed in the wall of the body so as to hold the block in position. Several sizes of these blocks are provided to better accommodate the different sizes of stock.

The end portions 11-11 of the dog are substantially alike in form and are each provided with a. bolt hole 13 to accommodate the bolt 12, the flat head 14 of which is adjustably positioned in the slots 15 of the face plate 16 of the lathe. These bolts obviously serve to secure the dog to the face plate while the set screw serves to hold the stock in position in the dog. The tails 17 and 18 of the dog are disposed from the extreme outer end portions of the dog and are arranged at substantially a right angle to the face thereof. The tail 17 is slightly longer than the tail 18 so that the dog may be set at a slight angle with reference to the face of the plate and so as to position one end of the stock obl' from its axis and in order to produce the taper cuts as before suggested.

Having thus described my invention what I claim and desire to secure by Letters Patent, is,

1. A lathe dog comprising a body having a central work opening and two oppositely eX- tended portions each provided with a tail disposed at a right angle therefrom and both extended upon the same side, one of formed, in en c h of said tails being longer than the other, a bolt hole formed in each of said extensions between the openingp and the end, and a set screw contained Wholly Within the dog to engage the stock in the opening. A lathe dog comprising -a body having afoentral Work opening and tWo oppositely extended portions eachproyided With a tail disposed at a right angle therefrom and lboth luponthe same side, one of said tails being longer than the other, a rbolt hole said extensions between the opening` land the end, removable blocks to lit the opening and to' support the stock, and a set-Soren7 contained Wholly Within the dog;` to engage the stock in the opening and hold it against the block.

Signed at Bridgeport, in the county of Fairfield and State of Connecticut, this 17th day of (lotober, A. D., 1918.

` v Y vMAXWELL E. PESTER. vWitnesses j C. M. NEUMAN,

LILLIAN M. ALLING.

Copies `o1 thsvpatnt may be obtained for five cents each, 'by addressing the Commissioner of 'Pa/cents, Washington, D. C. 

